Insulation resistance testing query

[bhamoggy]

Downstairs lighting is tripping rcd.
Circuit has 4 chandeliers with multiple bulbs and led downlights in the bathroom.
Can I just test IR on 250v setting between L,N & E and expect the same results as testing with 500v.

 

[telectrix]

usually same readings. the higher (500V) would possibly hihlight a higher resistance fault.just short L to N the 500V from them to E.

 

[bhamoggy]

And connecting L&N and testing IR to E at 500v will be ok and not damage equipment?

 

[cliffed]

And connecting L&N and testing IR to E at 500v will be ok and not damage equipment?

Correct